In May the legendary guitarist of Guns n' Roses fame launched his second solo album, Apocalyptic Love, with an app called SLASH 360. Created by a company called MATIvision, the program allows fans to watch him and his band play the album straight through, placing themselves anywhere in the studio to achieve the best vantage point.

"Basically, we shot the performance of the entire album," he explains. "They installed all these secretly-placed cameras around the room ... they link together and it makes one seamless shot."

Another app, called AmpliTube Slash Edition, allows users to turn their iPhone or iPad into an amp. Plug in a set of headphones and hook up a guitar, and you can approximate the sound of a rock concert without disturbing everyone in your immediate vicinity (Slash says he uses it to practice in hotel rooms).

The full version of the 360 app sells for $4.99, and the AmpliTube app goes for $9.99 on iPhones and iPads. Slash, no stranger to tech (he was immortalized as a character in the video game Guitar Hero), is optimistic about sales prospects.

"I would imagine maybe a quarter of the people who buy the record are fnaatical enough to go get the 360 MATIvision app," he says. "For the AmpliTube app, that is primarily for guitar players, so an even smaller percentage of people who buy the record I think would be buying that app. But I could be wrong."

If Slash is anywhere close to being right, the apps could add a nice revenue stream for the Rock-and-Roll Hall of Famer. His album sold 38,000 copies in the U.S. during its opening week.

Should Apocalyptic Love go on to move 200,000 units worldwide, his projections would yield $250,000 in sales of the 360 app alone. And even if only 5% of the people buying his album end up purchasing the $9.99 AmpliTube app, that would add another $100,000.

Slash didn't comment on the breakdown on his deals with AmpliTube and MATIvision. But it's clear that, even for someone who grosses nearly $100,000 per night on the road, the apps are a welcome addition to the portfolio.